It's been on the hard to short list for a while. I use Scottrade, TD Ameritrade, Schwab etc,, and they all have it hard to short. I rarely short @ Scottrade anyway because they run such a Mickey Mouse show over there. I'm not even sure why I keep accounts with them. Diversification I guess. I've been selling the calls regularly since the 17-18 area. I do it less now with the stock down so much. I tend to avoid shorting below $10, even on a lousy performer like ANGI, simply because of the risk/reward ratio and it's easier to get your head handed to you.
Do you like IB? How long have you used them and what others do you use? I've been with Schwab the longest, over 30 years and they'll let me do things others won't.
IB is good for margin account. Borrowing rate is unbeatable. A TD rep called me when I moved my account and told him about 0.16%+Fed overnight rate. He could only gave me a 50% discount but still way way way too high. Also, as long as you are not trading penny stock, their commission is $.01/share.
Currently ANGI is available at 6% fee.
Don't expect phone service after market close though, you will need to hold for a long time.
I have been using IB for some 10 years, and I think they are very good.
If you only need internet trading, they are fast, cheap and efficient.
Also, they seem one of the safest brokers around. (Check their financials.)
On the negative side, if you want/need to call them and solve some arcane problem, or need to use their customer support, they are average, at best. (I'm happy with them because I almost never have to do that...)