Awesome song from the new album 'Graduation', thought it sounded quite good in chord 
Pretty sure this is right as well.

Tuning: EADGBE

Fm                    Eb  Fm  Eb Fm
Do you think about me now and then?
Ab                    Bbm7          C#M7
Do you think about me now and then?
      Cm               Fm
Cause I?m coming home again
      Cm        Fm
Comin home again.

A simpler version of the first line would just be

Fm                    Eb
Do you think about me now and then?

This pattern is then repeated throughout the song. Listen for the timing. Simple.

Chords used:

           E  A  D  G  B  E
Fm:        x  8  10 10 9  8
Eb:        x  6  8  8  8  6
Ab:        4  6  6  5  4  4
Bbm7:      6  8  6  6  6  6
C#M7:      x  4  6  5  6  4
Cm:        x  3  5  5  4  3