
Just Call Them
Seriously, no need to get cute or clever - just call your actual[1] members of Congress and tell the intern who answers the phone that you support net-neutrality and give them your name, address, and phone number so they know you are actually in their district. Be polite and brief. Do not call anyone outside your district or State, only your actual representatives (and make sure you are registered to vote in their district!)
If just 500,000 people across the nation all did this on the same day, it would be far more effective than whatever online nonsense is decided upon. If you can't or won't call, send a snail-mail letter.
Remember, your members of Congress are almost certainly OLD - email is generally meaningless to them (doubly-so for form-letter email) so only phone calls and snail-mail will matter to them.
[1]Find your Representative here -> http://ziplook.house.gov/htbin/findrep
Find your Senator here -> https://www.senate.gov/general/contact_information/senators_cfm.cfm