Institution(s): 1. CEA Saclay
I will review what we have learnt on distant galaxies from far infrared surveys and present news ways to identify z>2 highly star-forming galaxies, often missed by standard techniques such as LBGs, that may represent the missing progenitors of passive z~2 galaxies. I will also discuss inconsistencies between SFR indicators that can be linked to the starburstiness and compactness of star-forming galaxies. Based on these results we will discuss the evidence in favor/against the existence of a SFR-M* main sequence up to z=4. The impact of the spatial distribution of star formation and its evolution with redshift will be discussed on the basis of newly obtained ALMA data.