today i was checking my adsense report i'v found click with no earning so i guessed it's invalid click, it's only one click i sent to google and told them about it and they replay i don't understand , is this invalid click or what they didn't tell me any useful info
It might have been someone who clicked twice and it didn't credit you for both clicks (possibility), or maybe it was Adsense Public Service Ads. It shouldn't be a problem, but if you ever have any suspicious activity (sudden high CTR, sudden huge increase in clicks) just let the Adsense team know and you should be good (They probably will ALWAYS send you that SAME EXTRA EMAIL!).
thx, i'll let them know if i noticed any of thes , but for now my account is still new the larg CTR i i got it was about 23% in one day that happened when i used adwords to promote my site in normal days it's about 7 or 8 %