It seems the search function only finds exact matches for members. It'd be useful to return approximate results, e.g. searching "oomer" would return "Boomer" unless an exact match is found.
Also, I think splitting search I to several options would be useful:
1. Entity - content (videos, podcasts etc.), members, or social (groups, posts, and comments)
2. Range - dates
3. Ranking - top, new, hot
Not necessarily three separate search fields, but combining these three dimensions lets you search for very precise results.