See here please:
http://en.support.wordpress.com/avatars/blavatars/
http://en.support.wordpress.com/avatars/gravatars/

Note: Gravatar/blavatar images are cached and frequently take several days to display after a change. The first place they tend to display is here in the forums. Don't keep uploading or the time for displaying will move forward. If several days have passed and that change is not in evidence then post here for Gravatar support > http://en.gravatar.com/site/contact-us/

See: http://en.support.wordpress.com/avatars/blavatars/
http://en.support.wordpress.com/avatars/gravatars/

For best practices for uploading gravatars, avatars and blavatars scroll down to below the video here: http://onecoolsitebloggingtips.com/2010/01/24/gravatar-avatar-blavatar/

Note: Gravatar images are cached and frequently take several days to display after a change. Do not keep uploading! The first place they tend to display is here in the forums. If several days have passed and that change is not in evidence then post here for Gravatar support > http://en.gravatar.com/site/contact-us/

To set the display on your own blog go to > Settings > Discussion and scroll down to the "Avatars" section.

Staff have linked a helpful step by step tutorial to the bottom of every Admin page http://learn.wordpress.com

Thanks

Tutorials and well-working search utilities certainly give an assist.

My means will still be to explore and test on my own first, as that is part of the joy of self-made discovery.

When I get stuck in the middle of something and want to move ahead, I go to the Search to see if someone else has asked a similar question. If I don't find my answer there, I ask on the forum.

To me, the forums are not just about one person having a need and others pitching in their time and experience to help them out. There is a gift to the giver in the giving, and everyone can benefit. I enjoy having a little interaction around the support forums and will also pitch in when I have something to offer.

Don't get me wrong, I am not offended in any way. But, just to have clarity in myself, since you wrote that 'most bloggers never post to the support forums at all,' does the community consider it bad form to do so?

Happy blogging (and being) to you, too.

We all have different learning styles, and mine is to learn by doing rather than reading.

I come along much faster and in a more relaxed way if I can ask for specific pointers when I cannot find it myself by exploring and testing.

Not as an excuse, but I am recovering from doing the 3rd factory default restore and subsequent rebuilding on my laptop in 2 weeks.

The PC is stable now, I am still getting settled. So I am slower than usual on things like tackling the learning center.

But, it is a great resource when I am at that stage. By the way, today is my first focus on the blog and it has been great fun.

Every WordPress.com username account is also a gravatar account and there is only one gravatar for each username account.
http://blog.gravatar.com/2013/04/03/gravatar-and-wordpress-com-together-forever/

See here please:
http://en.support.wordpress.com/avatars/blavatars/
http://en.support.wordpress.com/avatars/gravatars/

Note: Gravatar images are cached and frequently take several days to display after a change. The first place they tend to display is here in the forums. Don't keep uploading or the time for displaying will move forward. If several days have passed and that change is not in evidence then post here for Gravatar support > http://en.gravatar.com/site/contact-us/

Be sure you have selected your display preferences for gravatars and worked through all options here > Settings > Discussion from "Avatar Display __ Show Avatars " all the way to the end of the page and then click "save changes".

http://en.support.wordpress.com/avatars/blavatars/

Would like to change the blog avatar, have not been able to find the way.

Can someone point me to the page and section for replacing that image?

sometimes when I post a link on facebook, the old blog picture still shows up.

Unfortunately, we have no control over the images that Facebook chooses to display or when they choose to flush their image caches. We really only send them the URL of the post, and they hunt through that for the excerpt and images to include. From: http://en.forums.wordpress.com/topic/avalaible-facebook-thumbnail-issue?replies=7#post-1000734
Read also: http://developers.facebook.com/tools/debug
from: http://en.forums.wordpress.com/topic/fb-link-has-no-thumbnails?replies=4#post-936861

Note: Gravatar images are cached and frequently take several days to display after a change. The first place they tend to display is here in the forums. Don't keep uploading or the time for displaying will move forward. If several days have passed and that change is not in evidence then post here for Gravatar support > http://en.gravatar.com/site/contact-us/

Note: Gravatar and blavatar images are cached and frequently take several days to display after a change. Do not keep uploading! If several days have passed and that change is not in evidence then post here for Gravatar support > http://en.gravatar.com/site/contact-us/

Note: Gravatar and blavatar images are cached and frequently take several days to display after a change. Do not keep uploading! If several days have passed and that change is not in evidence then post here for Gravatar support > http://en.gravatar.com/site/contact-us/