You're accounts been hacked, leaving this comment as this usually results in the hacker unfriending and blocking loads of people on your friends list, so try and add back the people you remember (might be able to use the steam app to see who was recently messaged)

Hello my friend, this is the administrator of ♥♥♥♥♥♥♥™.
We have noticed you haven't logged in for 2 weeks, we're just checking to see that everything is okay with our biggest fan. Since you visited us last time we've updated the Gay section with many videos we know you will enjoy. See you soon!