OK, I'm going to lay down a rule, and excuse me if this seems presumptuous. In fact, it's the contrary practice that is presumptuous, though I am all too aware that it is the general one.
Nonetheless, I feel it's important, lest I lose all control of my Facebook page, to assert the rule, however quixotic the assertion may turn out to be.
Here it is: you must have been at least sort of a friend at one some point in my life in order for you to befriend me here. Let's define friendship this way: at some point in our lives we were inclined to greet each other with benign intent, at no point in our lives has either of us insulted or abused the other, (or if this happened, we have subsequently reconciled ) and at least once or twice in our lives, we have had a conversation that extended beyond small talk, and that left both of us with a feeling of having gotten to know one another better than we do the other minor acquaintances in our lives whom we do not count as friends.
This is not a very high threshold to meet. Quite a few people meet this minimal threshold, many of whom you can see listed in my friend's list. But, the world being a very large place, many more people in the world do not meet this threshold than meet it. There are 6 billion people on the planet; my friends list has 130 people on it. There's plenty of room for it grow without adding the many people I have encountered in life who do not meet this minimal threshold, nor can I understand why any of them would want to add me to their friends list.
From henceforth, I will not accept anyone who does not meet this threshold, and I encourage you, if ever, for some strange reason, I try to add you without myself meeting this threshold for you, to reject me in turn.