Mention gives you 3 alerts for free. Everyone should be following mention of their name and brand names (or school name) it is important. If you want more than 3, you'll have to pay. I use Google Alerts to track flat classroom and cool cat teacher - sad Google Alerts is gone, but here's an alternative.
This is an example of how you can share lists. Edutopia created a list of the panelists who "hung out" today with the edutopia panel from Finland and the University of Pennsylvania. Excellent group today.