Why advertisements missing in worldlinx ?

Tweet

The first ever PTC I joined was worldlinx.I also joined neobux,clicksense,palmbux etc too.As I liked worldlinx the most, I tried to get my first downline there.I got 3 direct referrals there.Now after few weeks ,I realized that I am earning much more from other sites than worldlinx.I do not have any direct referrals in any sites other than world linx.In last three days,I could not find a single ad in worldlinx.My downline also could not find any new clicks.What is happening to worldlinx? When even scam sites also managing to get lots of ads,why worldlinx is lagging behind?Are they too old to perform?