Due to abuse of the activity feed I think it is necessary for a new rule:

Repeated bumping of blogs/games/news/etc which have not been commented on for over a week will result in a +1 warn unless there is sufficient reason for your comment.

Possible acceptable reasons:

A game has been updated

Posting a good amount of feedback on a game/example/etc

An update to an old conversation which is still relevant today

Unacceptable reasons:

Lol

I remembered this and decided to bump it

*stupid joke*

etc

There will be an option added sometime soon which will allow you to comment on older stuff without bumping it on the activity feed.