Best place to check for kin member activity is live on the kinship panel ingame. Select "last time online" and click time online to order. Then you can search the kin site (here) to see who are their alts. I don't recommend that personnal information be entered on this site--you know the problems with social media :)
The site is primarily for information on upcoming ingame events such as raids and game information.
Enjoy the game!