I'll be voting out, and it really irritates me that leave voters are characterised (particularly by some media, like the Guardian) as ill-educated, small minded, xenophobic bigots. I have three degrees, and I'm married to an immigrant. My politics are generally liberal. I'll be voting to leave because I think the EU is opaque, bureaucratic and profoundly undemocratic. It feels like we have less and less influence over the way the country is run. And regarding immigration - I'm not against it at all, but the numbers are unsustainable and really starting to strain our public services. Whilst we're in the EU we have virtually no control over that, and I don't see it slowing down.
One of my friends said she'll be voting in "because the EU is better than the Tories". To my mind that's a rather ridiculous reason: we can kick the Tories out (if the voting public so decides), and at some point we will, but we can't kick out the EU bureaucrats, and we didn't even vote them in.
Trying to get the agreement of 28 countries on anything is virtually impossible (as the pitiful handling of the migrant crisis proves), many of the EU countries have severe economic problems, and I can't believe they're even considering allowing Turkey to join. Another reason for me to vote leave is that I think the whole thing may very well implode in the next few years, and we'd be better off watching from the sidelines should that happen.
However, in answer to the OP, whilst I would share my views with family and close friends, I won't be shouting them from the rooftops on social media, as lots of my friends are very 'politically correct' (I live in London and work in the non-profit sector) and I would probably get vilified!