Our stats are not real time stats. The data is cached and takes hours to update. See here for more on stats > http://en.support.wordpress.com/stats/
Do be aware the likes and shares are not pages view stats. Likes and shares are misleading when you are talking about page view stats. Your followers and anyone with a WordPress.com blog who is logged into WordPress.com can "like" and "share" your posts in several locations such as in email and the Reader without ever clicking into your blog and creating a page view stat.
You can control the length of the entry sent out on your RSS feed here > Settings > Reading
and choose the "summary" setting for your RSS feed or the "full text".
That does not affect the length of the post displayed on the front page or main page for posts on the blog. To create excerpts there we can split content by inserting "the more tag" http://en.support.wordpress.com/splitting-content/more-tag/
Site Stats - Additional Info
Can I use Google Analytics?
No, Google Analytics cannot be used on WordPress.com blogs at this time. http://en.support.wordpress.com/stats/#additional-info
Note: There is no upgrade you can purchase that changes this. There is no FTP access to free hosted WordPress.com blogs and we bloggers cannot install any plugins. To have plugins and Google Analytics you need to hire a web host and set up your own self hosted WordPress.org install. http://support.wordpress.com/com-vs-org/