Talk:Visiting Friends/@comment-173.160.11.105-20170323172856/@comment-30514476-20170401025343

Charging means clicking a room location, puzzle or tradesperson while on a Friends map. Doing so charges your friends trophies and rooms with your talent. This in turn gives you reputation points as represented by the blue doves. Increasing your reputation increases the amount of Friends you can visit and get bonus rewards for.

You should wait until you reach the required levels to open locked rooms instead of using rubies (unless you've an excess of them and don't care).