I can attest to Beeminder. If you're able to read and send emails daily, you can use it.
I will respect properly written articles on almost any subject. Not these.
One thing I demand from authors claiming to be supported by "science" is that they won't make me stop thinking in mid read. The articles behind these links do not respect the reader's opinion. Instead of making you think, they seek to shock, trump and convince. I've seen this style and these patterns before in articles about climate denial, xenophobia and religious fundamentalists. (Seriously, a lifestyle article is not a valid citation.)
I'm not saying the author has not done his fair share of reading. I'm saying he should stop waving the "this is science"-sign with one hand and be clubbing down his readers with the other.
It's probably hard to answer that accurately. I've read arguments about how commonplace polygamy and harems were and they usually go like this:
a) Old sources rarely take interest in the lives of common men, but we know that society tolerated multiple wifes and households in extraordinary people.
b) Household requires wealth. More households require more wealth.
c) Common men could support one household at most, if any.
d) Monogamy was de-facto standard (for economic reasons).
Hope this helps.
Damn you. ;-)
I actually liked it. Here are my reasons:
Oh, and a good friend of mine recommended reading it. But that's not a real reason, is it. ;-)