Oh, I'm see the number '11' and '1111' all the time, too! I have done some research before on numbers that we see often, and it 's called synchronicity -- the uncanny coincidence. It's definitely a good, positive thing if that happens to us, and I heard it's considered a sign that our angels/guides are sending us signals that we are 'on the right track' or doing the right thing.
To me, oftentimes, I'd look at the clock to find out what time it is. And the time would be like 9:11pm, 11:11am, 7:11pm... (you get the idea). And the funny thing is - it'd often happens when I think of my boyfriend.
I can't explain the logic of it, and I find it so fascinating! Hope this helps. And I wonder if anyone else there has experienced this and/or know more info. on it. Would love to read any sharing.