With facebook going through its advertisement section you get the option to run the ad continuously or you can choose when to stop the advertisement. With making a special, or having a limited-time option you could choose the advertisement to end at a certain time. This can greatly help your market and eventually make some sales. The other option is making the advertisement run continuously it gives your business more opportunity to reach more people.
Twitter & Instagram
I have used both of these services throughout the term but I am unable to use either one, a couple weeks ago Marry Me Wedding Designs has gotten hacked, and the only site I was able to fix it on was Facebook so far. Still working with Twitter and Instagram's team to fix this issue.