That radio show sounds like a great resource especially when it has a script. It’s about finding something that interest you and you’ll want to do in your spare time. In that way it ends up not being a chore but a leisure. I found a playlist of all the previous episodes for youhere. If you can’t find something on youtube it’s probably on youku(needs a Chinese VPN for certain shows) or ニコニコ.

If you want to start adding words to an anki deck I suggest using tagaini jisho to check for JLPT level. If it is N2 or below it is probably worth learning. This is only a general rule though. If there are words you see over and over you should always add them. Often they will be more common than the actual JLPT words. For example 清楚 is not part of a JLPT but is much more common than 葉書.
To check how common words are you can also search google for it (put “” around the word). If you get below 100k results it might not be worth adding.
I don’t suggest using jisho for determining if a word is common or not. That function seems to be flawed. You can always try to search for example sentences on there though. If there are 0 examples sentences for a word it is probably isn’t very common.
Personally I use a combination of all three to determine how common a word is. I do however only use google when I am in doubt if it is a word I want to add or not. I’ve made a script(there are a lot of parameters specific to my PC) that automatically looks up a word in 5 different dictionaries to make this process easier. Just press alt+f paste the word in the search field and then 1 second later I can check the Japanese definition, English definition, JLPT level and example sentences :P It also automatically copies what I have marked to a specific field of anki with hotkeys. I’ve added almost 1000 words to my own anki decks so you can almost guess that it is something I’d recommend to everyone.

I agree with you that lyrics have strange word choices at times, so it’s probably not the best source of words. But who cares? It just has to be something that interests you. This is what you do in your spare time so being effective isn’t really the main issue. Studying being fun is. Just use the sources I listed above and I am sure you can pick words from lyrics that are common and you’d want to learn. The radio show would probably also be great for this. Especially because it has a transcript.

Facebook is fine ;)

As for your question Aiki, I think it doesn’t make much sense as a beginner. Once you get to a higher level sub2srs can be an awesome way to make loads of very good anki cards in a very short time. Currently I’m busy watching “my boss my hero” and will probably end up making at least one episode in to anki cards. I will no doubt suspend some cards since studying every sentence of a drama doesn’t make much sense to me.