The daughter of missing Dublin woman Breda Delaney said there has been a number of possible sightings of her mother reported by social media users.
Emer Delaney said local gardai are also examining many CCTV cameras in the area in the hope of detecting images of her mother.
Emer renewed her appeal to taxi drivers and other early morning road-users who may have seen her mother.
Breda Delaney (72), a retired university lecturer, went missing from her house at Avondale Court, Blackrock, in the early hours of last Saturday.
"My mother was very, very severely depressed and very, very anxious and may not have been acting normally," she said.
She has not ruled out the possibility she could have travelled to the UK.
The emphasis of the searches is still on coastal and wooded areas of Dublin and Wicklow and there is also the possibility she could have gone to the south east as she is originally from Ferrybank in Waterford.
A meeting of volunteers helping in the search took place at Dun Laoghaire library last night.
Mrs Delaney (above) is 5ft 4in, of slight build, with shoulder-length blonde/grey hair and blue eyes.
When last seen she was wearing a white cardigan, a grey calf-length skirt and black shoes.
Emer urged anyone who may have seen her mother to contact gardai directly in Blackrock on 01 6665200.