Some Good Ahadith/Quraanic Aayah for Da'wah

[naseeha]

I was trying to come up with some good short aayahs/ahadith that we may use in order to give da'wah online, especially in places like Facebook, twitter etc... so I just thought I'd document some that I've gotten so far... for social media, the key is,

• Be short
  
• Be to the point
  
• Speak on issues that do not need much elaboration or are subject to dispute, or further interperation
  

so these are a few taht I have so far, maybe you guys can help more:

• Then he (the man) said, "Inform me about Ihsan." He (the Messenger of
  Allah) answered, " It is that you should serve Allah as though you could
  see Him, for though you cannot see Him yet He sees you." He said,
  "Inform me about the Hour." He (the Messenger of Allah) said, "About
  that the one questioned knows no more than the questioner." So he said,
  "Well, inform me about the signs thereof (i.e. of its coming)." Said he,
  "They are that the slave-girl will give birth to her mistress, that you
  will see the barefooted ones, the naked, the destitute, the herdsmen of
  the sheep (competing with each other) in raising lofty buildings."
  Thereupon the man went off. - Hadith Jibreel
  
  
  
• None of you [truly] believes until he loves for his brother that which he loves for himself.
  Narrated by Anas bin Malik and reported by Bukhari and Muslim
  
  
  
• Surely the believers are they who, when allah is mentioned, their hearts shakes.
  
  Surah Anfal.
  
  
  
• Umar ibn al‐Khattab reports that the Prophet, may Allah bless him and
  grant him peace, said,
  ʺIndeed among the servants of Allah are people who are neither
  prophets nor martyrs themselves but whose place both prophets and
  martyrs will envy on that Day.ʺ Those who were with him asked, ʺO
  Messenger of Allah, tell us who they are.ʺ He said, ʺThey are those who
  loved each other for the sake of Allah though there was no bond of
  kinship between them and no thought of gain. By Allah, their faces
  shine with light. They are bathed in light. When men take fright they
  fear not. When men are struck with sadness they feel no sorrow.ʺ Then
  he read the verse,
  ʺMost surely the friends of Allah are (those) who have no fear
  and who do not grieve.ʺ (10:62)
  Reported by Abu Dawud
  
  
  
• Abu Hurairah said that the prophet (SAWS)
  said; Allah will say on the day of judgement " Where are those people
  who loved each other for my sake, I would shade them in my shade on a
  day when there is no shade except my shade"
  Narrated by muslim