Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Most people here will tell you to find out for yourself, since every chip is different. Mobile 2500+ generally overclock pretty well, I'd expect at least 2.4 GHz but probably closer to 2.5 GHz as a minimum. No guarantees either way. I've purchased from eWiz before, they're pretty good, but I'd suggest you give Newegg a look. That same processor sells for about $95 there currently.