121103 Seunghyun @chungxuan used Hongki's pic as his twitter DP..
and here is his conversation with the real Hongki.. kekeke..
chungxuan 안녕하세요? 이홍기 봇 입니다.
Translation: Hello? This is Lee Hongki bot.
skullhong @chungxuan 너뭐냐….
Translation: @chungxuan Who are you….
chungxuan @skullhong 당신 봇 입니다.
Translation: @skullhong Your bot.
and then, fans start tweeting him..
Song_takiel: @chungxuan 이홍기씨 안녕♡♡♡ FTISLAND 멤버 중에서 가장 멋있고 착한 멤버는 누구〜???????ヽ(●´∀`●)ノ역시 송승현씨군요??????ㅋㅋㅋ”
Translation: Hi Lee Hongki-ssi♡♡♡ Who is the coolest and nicest member in FTISLAND~???????ヽ(●´∀`●)ノOh, it’s Song Seunghyun-ssi?????? Kekeke”
chungxuan @Song_takiel: ㅡ good
bb_936: @chungxuan ㅋㅋㅋㅋㅋㅋㅋㅋㅋ봇이니까답멘좀요..점하나라도
Translation: @chungxuan Kekekekekekekekeke! Since you’re a bot, give a reply mention.. Even if it’s a dot
chungxuan @bb_936 ㅡ
. 
(really a dot.. kekeke..)
pri_jyl: @chungxuan 요즘 승현이오빠가 못생겨진것같아요 그렇죠 홍기오빠?
Translation @chungxuan Seunghyunnie oppa is getting uglier these days. Don’t you think so, Hongki oppa?
chungxuan @pri_jyl ㅡ식상한 질문이군요. 축하드립니다 앞으로 승현씨와의 영원한 적이되셨습니다.
Translation: @pri_jyl:ㅡ Had enough of such questions. Congratulations. You have become Seunghyun-ssi’s forever enemy.
CmH_S2_HeE: @chungxuan 키윽하나라도 보내줘요ㅠㅠ
Translation: @chungxuan Send a ki-euk (ㅋ) too ㅠㅠ
chungxuan @CmH_S2_HeE ㅡ프로필사진이 마음에들어 원하는 답멘남겨드립니다. “키윽”
Translation: “@CmH_S2_HeE: @” ㅡI like your profile picture. I’ll give you a mention reply that you want “ki-euk”
chungxuan 아 봇힘들다..ㅎㅎ 바꿔야짐
Translation: Ah, it’s tough being a bot.. Hehe! I’ve got to change back
Trans by ying1005@withtreasures
and he changed into a new DP as below after that.. keke.. it has been a while since they're trolling on twitter like this.. keke