Yes and no, yes you can send 'batch' MMS by iterating thru a list of numbers you want to send to, but if you plan on sending a lot, you are going to want to lease a short-code (for about $1000/month) in order to qualify for the higher sending limits.
With a regular number you can send at most one message per second. With a shortcode, you can up that to 30 messages per second.
You might be able to get away with low-level 'bulk' sms on a regular twilio number, but don't be surprised if you get shut down if you are spamming or violating the terms of use (see Boosters post above for the link).
