Google this number again and there is another hit that has 15 similar stories, including mine. Got the same thing. The first text said "Hi :)" and when I didn't respond I got another text the next day suggesting we chat on YahooIM screen name irelandgirlie1 . I didn't respond, I think they want to hack into computers.

I was just hit by this annoyance as well.  Went something like:
-Heyy :P
-who is this?
-let's talk on Ya-H00 IM User-name is madisonchikie1
-please remove this number from your phone
-do u remember who I am?? A.d.d. me to refresh your memory
-I have no idea who this is, hence my original question. pls stop texting me
-Quick a.d me I'll be waiting on you !!
-stop texting me

And finally the texting stopped.  Like others, wish it could be blocked.  But I hope this is helpful to others.

Got one on the 20th as well. Reply text when I asked "who is this" said "how about we catch up on y!msngr Screen-name is annagurly".

I just got the same thing...thanks for verifying it's a hoax, all!

Just got a text from this unknown number. asked who they were. no reply.

I got the same kind of text, they wanted to talk on Yahoo IM as well screen name was cieragurlie......I told them I don't talk to strangers.

Just received a "Hii:)". I asked her if she was coming over to my place or if I was going over to hers. Reply: How about we chat on Ya-H00 IM User-name is averywoman73. Totally a scam

I just got the same message. Said Ya Hoo IM name was madisonchikie1. Told me to add them to remember who they were, to help my memory, Told them that if I could remember them I would not be asking why they were. Told them to either tell me or I would block them and they did not send another text. I think it is someone trying to get you to log onto your computer, add them to IM to allow them to hack you computer. I would NOT do it. Bad idea.

same here.....3 AM in the morn...Text seid "Hi" that is all ? hope someone finds the reason for this soon
BOB

Same thing here. Yesterday I got a text saying "Hey :)" . I didn't respond because i looked up the area code and its in GA, no where near me. Today I got another text saying "Lets talk on YA-HOO IM, screen name irelandgirlie1" . I still didn't respond, but I decided to look up the number and found this... Weird. Sounds like a Catfish type of thing!

Same thing happening here, They keep telling me to chat with them on yahoo messenger kylieflirty17 really? This is ridiculous I have important business to take care of and they keep blowing up my phone

I have recieved several text message from 678-774-7657 asking me to join a chat with them. It's getting really annoying because they won't tell me who it is.

I received the same message saying to add them!

I got a message today saying pretty much the same think but wanting me to chant on Y messenger to taylorchickie345. I responded how about NOT!  How can we report or block this number from calling or messaging?

I just got the same exact txt msgs. how and where can we report his??

I just received a text msg. from this number, saying "Hey :P", then I said "Hello You" trying to be funny, then they texted "Do you remember who I am?"  I said "If you give me a hint, I might."    I never rec'd another text reply again.....   Now that I'm seeing the same thing happened to Virginia (above), I realize it must be a scam of some sort.....

Did they ask if you remembered who they are???

Have got 2 text messages from this number. Does anyone know who or what this is???

Texted me outta nowhere. Probably a scammer trying for infor or something.