Basically, you have to click the the tab 'Propose Marriage'. Make sure to make your things do romantic things like kissing and hugging before you do so. If you don't, the other sim will get creeped out and refuse.
No. Someone can hide their relationship status from friends (so you wouldn't see anything at all), but Facebook can't be used to send false information to one person.
Just make a tail that's about 1 inch for every 2 stitches. Any craft store that sells knitting needles should have circular needles that are just the same size as...
There is no way to get teenagers pregnant without a mod. Check your favorite modding site, but be careful as mods affect the way the game works and may cause...
Press Ctrl-Shift-C and type in "Testingcheats on" (without the "s) and then you can shift click on a Sim or mailbox and stop the needs from going down.
Make sure you take care of your Sims' needs. Be sure to use an umbrella in the rain, wear light clothing in the summer, warm clothing in the winter, etc.