Sorry to compare everything to Facebook, but there are many nice features Facebook uses that would be wonderful on myHeritage.com. I have (as have many others) commented on the need for the Family News slot to be much bigger. It's size prohibits practically every complete thought one could have. It would also be nice if others were allowed to comment on that person's post. I don't know if I would go so far as to suggest the "like button" that Facebook uses, but that's also a possibility.
