The quote from me is probably too strongly worded on my part, but I really don't see the added value. You may have made it instrumental to your social life, but my personal opinion is the price is too high. Unfortunately, when the majority of people choose to pay the price, it switches from being a personal choice to being an expected exchange. This is fundamentally about the right to privacy and it's not something a rational person would trade away for something that can (and has been!) achieved without the terrible price tag.
Usually if something provides a high value, like a car, you invest in it so you can see the returns. My qualm is not with the messaging service per say (I take more issue with the mass posts people make about their kids or others without consent, I believe that's wrong and cheapens inter-personal relationships). I mean, you have to realize they take your keyups, they know when you've reworded before sending and they're tying what you might think of as a personal conversation to the valuable profile you're consciously helping them build and capitalize on.
I've been around a lot of people using messenger. I've found using the phone or email somewhat increases the likelihood of something tangible happening (general follow through) as well as thoughtfulness of the replies I receive. Obviously that's anecdotal and the jury's still out. I guess my question is, how can you assert Facebook would help someone's social life?
I'm not debating your happiness with it. I'm just a little surprised your so comfortable using it.
More direct means would include chatting in person, the proverbial snail mail (you got to admit, receiving a letter from someone you respect/love/h[oh]ld dear is great), phone call or text message. Except for the last one, each one contains a ton more social queues than a chat group.