Do what x3me88 said.
Here’s how you should do it to get rid of this socialsite/blogplay stuff:
1) Remove all unwanted text or replace it with your own. It could be just sociable.php file or more like sociable_output.php etc. (use
grep -R 'sociablesite' ./*
to locate all occurrences).
Save your changes.
2) Go to WP back-end > Sociable Options and record all your settings (so you can restore it later)
3) Hit the ‘Reset Sociable’ button.
4) Restore your settings back.
The text should be gone now, at least on twitter, I didn’t check it with Facebook – don’t really care.
Disclaimer: You’ll need to repeat this procedure after each upgrade of Sociable plugin.