I consider very few people “worthless.” Almost everyone has a redeeming quality. Many less-sociable acquaintances are quick to judge others and shut the door. I don’t think that’s fair or reasonable. No, I’m not saying you need to be friends with everyone. Hell no. But don’t throw out fools just because you can’t appreciate foreign personalities.
I make a casual mental effort to divide people into two groups:
People I like.
People I respect.
The “likes” tend to carry genuine personalities I can connect with. These individuals become friends. The “respects” have notable skills or chapters of knowledge I admire. These individuals find a place in the business rolodex.
Most people I meet fall into one category or another. I respect a large number of professionals, but never plan to break bread with them. They sit on my contacts list anyway.
The true keepers fall into both lists. These are the people with whom you build projects, share ideas, explore the world, socialize, dine and spend the rest of your life.
Woe to those who fall on neither list.

PayPal co-founder Peter Thiel
I’ve had enough. Fitness classes, yoga, waxing, Brazilian blowouts, facials, tattoos, beauty products, home & garden, apparel, too many hair cuts, too many massages, too many poorly yelped restaurants. I cannot delete these daily spam notes quick enough. I would never spend money on any of those things. I’ve been registered to both sites for over a year and only purchased five coupons. That means that I found only 0.7% of all available deals relevant and 99.3% mostly irrelevant. Terrible odds. I unsubscribed from both services this morning.
Facebook is very powerful right now, pervading our everyday lives and businesses. And they have no intention of stopping. While not as acquisition-hungry as Google, which has a reputation for buying up every great small business in sight, Facebook is expanding scope like hotcakes. Places, Deals, Marketplace, Photo Recognition, Questions, Games, Groups, Mobile…the list of Facebook products grows everyday.